Animation Flash ActionScript

package
{
    import flash.display.*;
    import flash.events.Event;
    public class Main extends Sprite
    {
        public function FrameAnimation()
        {
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        protected function onEnterFrame(event:Event):void
        {
            trace("animating");
        }
    }
}